I don't know if Facebook would know about the event in reverse - but if there is an asset in Facebook that is attached to the event then the templates on the site would use the client-side Facebook API to query for photos or other activity streams.

Right, the paper (or user entering the event in the user dashboard) would need to include the Facebook event ID somewhere... then our templates could suck in all of the information that FB made available in the API (like all the photos uploaded to FB).